I don't agree with comments that in terms of risk Mexico is the same as Canada or Aruba, nor do I suggest that people should not go there. Everyone has a different level of risk tolerance and that is factored into their travel plans.
Here is a link to the state department and the ministry of foreign affairs. Sorry if these were posted already. Personnel anecdotes are great to read particularly when reviewing places to stay and go, but in assessing risk I suggest taking professionally gathered governmental information into consideration as well. While the risks are quite a big range in the listed countries, its not exactly a list of Rick Steves Books:
http://travel.state.gov/travel/cis_p...w/tw_1764.html
http://www.voyage.gc.ca/countries_pays/menu-eng.asp